Truck hoist



W. G. MAYER.

TRUCK HOIST'. APPLICATION FILED FEB. 25. 1921.

1,418,387. PatentedJune 6,1922.

2 SHEETS-SHEET I.

ATTGRNIY W. G. MAYER.

TRUCK HOIST. APPLICATION man FEB. 25, 1921.

Patented June 6, 1922.

2 smzns-snz'n 2.

ATTORNEY UNITED sTATEs PATENT OFFICE.

,WTLLIAM; e. MAYER, or PITTSBURGH, rnnnsxnvanm.

TRUCK HQIST.

' T sn e fica ione l t r t Patented June 6;, 1922'...

Application filed February 25, 1921. Serial No. 447,736.

To all whom it may concern}.

Be it known that I, WI'LLIAM G. MAYnu,

'a citizen of the United States, residing at Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented new and useful Improvements in Truck Hoists, of Which the following is a specification.

This invention relates to dumping trucks,

and more particularly to a hoist or "lifting means for elevating the frontyof the truck" operating shaft in conjunction with a cable connected to the truck body and differential means whereby the rate at which the cable is wound upon the shaft is reduced relativeto the speed of' rotation. of said" shaft thus materially increasing the force applied for lifting the truck body. Further objects will appear from the detailed description.

In the drawings:

Figure 1' isa side view of the truck showing thehoist constructed in accordance with my invention as applied.

Figure 2 is a front view of the truck body and the hoist and associated parts.

Figure 3 is a detail, partly in section, of the means for steadying the hoist when the truck body is in lowered position.

Figure 4; is a detail rear view of the head beam of the hoist.

Figure 5 isa diagrammatic view illustrating the relative positions of the sheaves when the truck body is fully raised.

Figure 6 is a similar view when the truck body is in lowered or normal position.

Truck A may be of any suitable or preferred type and includes a chassis'B to which a sub-frame C is hinged at D to permit raising of bod 1 of the truck as illustrated in Figure 1. caring blocks 2 are secured by clips 3, or in any other suitable or preferred manner, to side sills b of chassis B. Each of these blocks is provided at its forward end with two spaced ears 4between which is pivotally secured the lower end of side arm 5 of boom 6. The upper ends of arms 5 are secured to the ends of blocks 7 provided at each end of a head beam 8, this head beam being a casting and each of the blocks 7 being provided with a recess for reception of a sheave9 rotatably mounted in the block on a pin 10. The boom constructed and mounted in the manner described has free movement toward: and away from the front of body 1. p

A channel bar 11 issecured to the front of the truckbody centrally thereof and. is

provided at its lower end with a bracket12 in which is mounted a sheave-13. A. cable 14 is passed over sheaves 9 and}; beneath sheave 13, one end of this "cable, being wound on a'drum' 15 secured; on'an operatg ing shaft, 16 rotatably mounted in bearing blocks 12. This shaft is provided" at each:

end with a squaredelement 1 for reception of a crank handle for rotating theshaft in the known manner.

at the opposite side of. channel bar 11 from drum 15, distant from the channel bar.

When body 1' is in normal. or lowered position, boom 6is in substantially vertical position closely adjacent to, the front of the The other end of cable 14 is wound upon a drum 18 of greater di-. ameter than drum 15' secured; on shaft .16 '75 the drums beingf positioned eq ut V body, as in Figure 2."v When it is desired to raise the front of the body for dumping purposes, shaft 16 is rotated in such'direcs tionas to wind cable 14onto drum 1 8 and off of drum 15, the cable being wound on these drums in opposite directions. Winding of the cable onto drum 18 exerts a lifting effect upon sheave 13 thus elevating the front of the body. As the weight of the body as it is lifted is supported by cable 14 there will be a pull exerted on the cable which will tend to rotate shaft 16, through the medium of drum 15, in lifting direction;

and as the cable is unwound from drum 15 as it is wound onto drum 18, a diflerential effect is obtained by means of which the rate at which the cable is wound onto drum 18 relative to the rate of rotation of shaft 16 is materially reduced thus increasing the force applied to sheave 13 for raising the front of body 1; this renders it possible for the front of truck body 1 to be readily elevated for dumping purposes by a single operator and also eliminates all necessity of providing the usual reducing gearing or other rather complicated mechanisms employed for this purpose. In addition the construction employed is direct actlng and is composed of a minimum number of parts of simple and durable-construction. When it is desired to lower the truck body the fat be noted more clearly from Figure 8, blocks 7 at the ends of beamv 8 project rearwardlv an appreciable distance so as to follow the.

front of the body during'the hoisting operation, channel bar 11 passing between blocks 7 Thi provides a space between the blocks which is suficient to accommodate sheave 13 thus permitting the front of'body 1. to be elevated to such an extent as to bring sheave, 13 into horizontal alignmentwith sheave 9, if desired or necessary By this.

means it is possible to elevateqthe front of the body to a much greater extent than by. means of hoists of known type. now com monly used.

By arranging the sheave 13in alignment:

with channel bar 11,'as inFigure 1, and providing the blocks vf7 at the ends of the head beam 8,'it is possible to raise sheave 13 into substantial alignment witli'sheaves 9 as in Figure 5, thus permittingraisingof the front of truck body 1 to a relatively great height. As will be understood, the cable 14 1s of such length that when the truck body is thus raised it is wound onto the largerdrum 18 and off of drum 15, the cable being wound off of drum -18 and onto drum 2 15 when the body is lowered, as in Figure 6.

While I have-illustrated and described herein the preferred construction of my in vention it may be found desirable, in practice, to resort to changes in details of construction and arrangement of parts, and I intend-to'include all such variations, as fall within the scope of the appended claims, in this application in which the preferred form only of my invention is disclosed.

-- What I claim is 1. In combination with a truck frame and a tiltably mounted body, a boom carried by the frame, an operating shaft rot'atably mounted on the frame, .two drums of different diameters secured on said shaft, sheaves carried bythe boom, a sheave secured to the body below and between the boom sheaves,

and a cable passed over theboom sheaves and under the body sheave,said cable being,

wound upon the drums in opposite direij tions.

two sheavesmounted in advance of the bodyand spaced apart transversely thereof,said

2. In combination with a truck; frame and a body hinged at its rearward end ;to said V frame, a rotatably mounted shaft, drums of.- difierent diameters secured on said shaft sheaves being free from the body andiheld overthe sheaves and having its ends secured to and wound upon the drums in opposite against vertical movement, a, cable passed direction and a member secured to the body and between the sheaves, the cable being passed beneath said memben. In testimony whereofI affix my signature.

WM G. MAYER. 

